Mode Multiplication of Cylindrical Vector Beam Using Raytracing Control  

作　　者：Jing Wang Qingji Zeng Haisheng Wu Chuangxin Xie Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen 王晶;曾庆计;吴海生;谢创鑫;叶华朋;董泽;范滇元;陈书青(Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China;Guangdong Provincial Key Laboratory of Optical Information Materials and Technology,and Institute of Electronic Paper Displays,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China [2]Guangdong Provincial Key Laboratory of Optical Information Materials and Technology,and Institute of Electronic Paper Displays,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China [3]School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Chinese Physics Letters》2024年第9期40-51,共12页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.62271322);the Guangdong Basic and Applied Basic Research Foundation(Grant No.2023A1515030152);the Shenzhen Science and Technology Program(Grant No.JCYJ20210324095610027);the Natural Science Foundation of Top Talent of SZTU(Grant No.GDRC202204)。

摘　　要：Cylindrical vector beams(CVBs)hold significant promise in mode division multiplexing communication owing to their inherent vector mode orthogonality.However,existing studies for facilitating CVB channel processing are confined to mode shift conversions due to their reliance on spin-dependent helical modulations,overlooking the pursuit of mode multiplication conversion.This challenge lies in the multiplicative operation upon inhomogeneous vector mode manipulation,which is expected to advance versatile CVB channel switching and routing.Here,we tackle this gap by introducing a raytracing control strategy that conformally maps the light rays of CVB from the whole annulus distribution to an annular sector counterpart.Incorporated with the multifold conformal annulus-sector mappings and polarization-insensitive phase modulations,this approach facilitates the parallel transformation of input CVB into multiple complementary components,enabling the mode multiplication conversion with protected vector structure.Serving as a demonstration,we experimentally implemented the multiplicative operation of four CVB modes with the multiplier factors of N=+2 and N=−3,achieving the converted mode purities over 94.24%and 88.37%.Subsequently,200 Gbit/s quadrature phase shift keying signals were successfully transmitted upon multiplicative switching of four CVB channels,with the bit-error-rate approaching 1×10^(−6).These results underscore our strategy’s efficacy in CVB mode multiplication,which may open promising prospects for its advanced applications.

关 键 词：STRUCTURE MULTIPLICATIVE APPROACHING 

分 类 号：O43[机械工程—光学工程]